It really depends on your who your workers are, but I absolutely don't use emojies in work emails. I do use them in teams messages though.
Emails are for conversations I want documented. Chat messages are the equivalent of a desk conversation.
Also, yeah, angry emojies are still taboo at any type of work chat for me. Can't be seen as angry at the office.
Re: the electric ones
It's like a 9v battery. It hurts, but I can't stop licking it anyways.